|Author:Laxman Burdak, IFS (R)|
Kaseru (कसेरु) was one of the nine divisions of Bhārata, a region south of mount Meru, according to the Varāhapurāṇa chapter 74. Kaseru is surrounded by an ocean (sāgara) and is one thousand yojanas in extent. Meru is one of the seven mountains located in Jambūdvīpa, which is ruled over by Āgnīdhra, a grandson of Svāyambhuva Manu, who was created by Brahmā, who was in turn created by Nārāyaṇa, the unknowable all-pervasive primordial being, who was created by Brahmā, who was in turn created by Nārāyaṇa, the unknowable all-pervasive primordial being.
Kaśeru (कशेरु).—A lovely daughter of Tvaṣṭā, the Prajāpati. Narakāsura abducted Kaśeru when she was fourteen years old. She was one of the virgins married by Śrī Kṛṣṇa who won a victory over Narakāsura. (Mahābhārata Sabhā Parva, Chapter 38, Dākṣiṇātya Pāṭha). 
विजयेन्द्र कुमार माथुर ने लेख किया है ...कशेरु (AS, p.152) 'इंद्रद्वीपं कशेरुं च ताम्रद्वीपं गभस्तिमत् गांधर्ववारुणं द्वीपं सौम्याक्षमिति च प्रभु': महाभारत सभापर्वा 38, दक्षिणात्य पाठ . अर्थात शक्तिशाली सहस्रबाहु ने इंद्रद्वीप, कशेरु, ताम्रद्वीप, गभस्तिमत्, गंधर्व, वारुण और सौम्याक्ष द्वीप को जीत लिया था. प्रसंग से यह इंडोनेशिया का कोई द्वीप जान पड़ता है. क्योंकि इंद्रद्वीप = सुमात्रा का एक भाग, ताम्रद्वीप = लंका, वारुण = बोर्नियो